<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>output标签</title>
</head>

<body>
<form oninput="x.value = rg.value">
	<input type="range" value="50" max="100" min="0" id="rg" />
    <output name="x" for="rg" ></output>
</form>
</body>
</html>
